Apparatus for screwing together and unscrewing joints of pipe and the like



1,617,509 Feb. 15, 7. H. G THRIFT APPARATUS FOR SCREWING TOGETHER AND UNSCREWING JOINTS OF PIPE AND THE LIKE 2 Sheets-Sheet 1 Feb. 15 192?.

H. c. THRIFT APPARATUS FOR SCREWI NG TOGETHER AND UNSCREWING' JOINTS 0F PIPE AND THE LIKE 1921 2 Sheets-Sheet 2 Origina? Filed Nov. 12.

att c: 14 211 5 Patented Feb. 15,

PATENT OFFlCE.

HOMER o. manner, or minxnuannrr, 'rnxns.

AEPABATUS FOR SOEEWING TOGETHER AND UNSCREWING JOINTS OE PIPE .AI ID THE LIKE.

Application filed November 12, 1821, Serial No. 514,742. Renewed June 15, 1925.

This invention relates to new and useful improvements in an apparatus for screwing together and unscrewmg joints of pipe and the like.

One object ofthe invention is to provide an apparatus of the character described which is specially adapted for use in unscrewing the joints of pipe .or casing as the same is withdrawn from abandonedwells.

Another object is to provide an inexpensive and simple apparatus which may be easily applied to the work of unscrewing the oints'of pipe or casin as the same is withdrawn where the ordinary, appliances used for unscrewing pipes or casing in well drilling are not available; however, the machine may be used generally for screwing together or unscrewing joints of rods, or

pipe,

With the above and other objects in view the invention has particular'relation to certain novel features of construction, operation and arrangement of parts an example of which is given in this ,specification'and illustrated in the accompanying drawings wherein;

Figure 1 shows a side elevation of the de vice as applied to the work.

Figure 2 shows a vertical sectional view thereof taken on the line 22 of Figure 3 and Figure 3- shows a horizontal sectional view taken on the line 3, 3 of Figure 2.

Referring now more particularly to the drawings wherein like numerals ofreference designate similar parts in each of the figures, the numeral 1 designates an annular driving member whose periphery is formed with screw ear teeth 2. On opposite sides of these te'et the driving-member is formed with peripheral race ways 3.t o receive the .anti=friction bearings 4 and these bearings are retained in place. bymeans of the race way rings 5, 5 which are surrounded lay annular bands6, 6, enclosed by a surroun ing jacket 7.

A jointed driving shaft 8' is provided which rotates in suitable bearin s 9, 9 fastened to the rings 6. The shaft as a worm v gear 10 keyed thereon and in. mesh with the teeth 2.. a

ili portable so as to be w e membe means for the sectional pipe gripping jaws 13. The inner faces of these jaws are arcuate 'and serrated forming engaging teeth and the outer sides of the-jaws have flat bearing faces 14 a ainst which the bosses 15,

.projecting inward y from the driving member, bear.

The numeral 16 designates an eye-bolt which is fastened to the jacket and to which one end of the cable 17 is attached. This cable passes over the sheaves 18 and 19 carried by theboom 20 and attached to the other end .of thecable 17 is a weight 21.

The device is thus suspended in positlon for I use and is clamped around the pipe 22, to be rotated, as shown in Figure 1.

A bracket 23 is fastened to the upper and lower rings 6, 6 and is provided with a clevis 24 to which a. suitable cable 25 is secured at one end, the other end of this cable being attached to a suitable support not shown). When; power is applied t rough the shaft 8 the driving member will be turned in the direction indicated b the arrow in Fi re 3 and the jaws 13 wi 1 engage with t e pipe. As power is applied said jaws will be contracted by wedging against the bosses 15 and will securely grip and turn the pipe. 4 The a paratus described is comparatively light and of simple construction and is rea available for use never needed.

What I claim is: l

A device of the character described including a jacket, a ring-like driving member therein through whlch pipe is adapted to extend, pipe engaging jaws mounted within ,said driving member, the outersides of said jaws having flat bearmg faces, bosses rojecting inwardlyfrom the driving mem er, and bearing against said respteictive faces, and means for rotating said ving 1'. V In testimony whereof'I have name.

[signed m HOMER C. THRIFT. 

